extract jar file programatically

[Cloey Tan]

Dear all,

Using java, is there a way to extract jar file such that i can look for certain package, and list out out all the files belong to that particular package? Hope for some guidelines and helpful resouces.

[Ernest Friedman-Hill]

A jar file is actually just a zip file. You can use the java.util.jar package to look through a jar file and find whatever entries you want; for example, this prints out the name of each entry in a jar file:

JarFile file = new JarFile("file.jar");
for (Enumeration<JarEntry> enum = file.entries(); enum.hasMoreElements();) {
    JarEntry entry = enum.next();
    System.out.println(entry.getName());
}

[Cloey Tan]

Thanks it works. but i have another few questions to ask here
I create a project and build it with maven using the following simple example:
http://maven.apache.org/guides/getti...e-minutes.html

Then, i add a new file, called test.xml under the main root of the project, then use the above code to loop through the files, test.xml doesnt seem to get listed. And i found from this site http://www.cezwright.com/tools/java/jar_war_ear.htm, that jar doesnt include xml file, but then pom.xml get listed, but not test.xml which has been newly added.

Besides, if i were to package everything in war, how to do the settings in pom.xml?

[Martijn Verburg]

Hi Cloey,

Can you please re-post your last question in our Ant, Maven and Build tools forum, you'll get better help there